summaryrefslogtreecommitdiffstats
path: root/net/mac80211/vht.c
blob: b2b09d421e8b8f0e61333927af21ea6c9787aa8c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
// SPDX-License-Identifier: GPL-2.0-only
/*
 * VHT handling
 *
 * Portions of this file
 * Copyright(c) 2015 - 2016 Intel Deutschland GmbH
 * Copyright (C) 2018 - 2022 Intel Corporation
 */

#include <linux/ieee80211.h>
#include <linux/export.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "rate.h"


static void __check_vhtcap_disable(struct ieee80211_sub_if_data *sdata,
				   struct ieee80211_sta_vht_cap *vht_cap,
				   u32 flag)
{
	__le32 le_flag = cpu_to_le32(flag);

	if (sdata->u.mgd.vht_capa_mask.vht_cap_info & le_flag &&
	    !(sdata->u.mgd.vht_capa.vht_cap_info & le_flag))
		vht_cap->cap &= ~flag;
}

void ieee80211_apply_vhtcap_overrides(struct ieee80211_sub_if_data *sdata,
				      struct ieee80211_sta_vht_cap *vht_cap)
{
	int i;
	u16 rxmcs_mask, rxmcs_cap, rxmcs_n, txmcs_mask, txmcs_cap, txmcs_n;

	if (!vht_cap->vht_supported)
		return;

	if (sdata->vif.type != NL80211_IFTYPE_STATION)
		return;

	__check_vhtcap_disable(sdata, vht_cap,
			       IEEE80211_VHT_CAP_RXLDPC);
	__check_vhtcap_disable(sdata, vht_cap,
			       IEEE80211_VHT_CAP_SHORT_GI_80);
	__check_vhtcap_disable(sdata, vht_cap,
			       IEEE80211_VHT_CAP_SHORT_GI_160);
	__check_vhtcap_disable(sdata, vht_cap,
			       IEEE80211_VHT_CAP_TXSTBC);
	__check_vhtcap_disable(sdata, vht_cap,
			       IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE);
	__check_vhtcap_disable(sdata, vht_cap,
			       IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE);
	__check_vhtcap_disable(sdata, vht_cap,
			       IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN);
	__check_vhtcap_disable(sdata, vht_cap,
			       IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN);

	/* Allow user to decrease AMPDU length exponent */
	if (sdata->u.mgd.vht_capa_mask.vht_cap_info &
	    cpu_to_le32(IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK)) {
		u32 cap, n;

		n = le32_to_cpu(sdata->u.mgd.vht_capa.vht_cap_info) &
			IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
		n >>= IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
		cap = vht_cap->cap & IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
		cap >>= IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;

		if (n < cap) {
			vht_cap->cap &=
				~IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
			vht_cap->cap |=
				n << IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
		}
	}

	/* Allow the user to decrease MCSes */
	rxmcs_mask =
		le16_to_cpu(sdata->u.mgd.vht_capa_mask.supp_mcs.rx_mcs_map);
	rxmcs_n = le16_to_cpu(sdata->u.mgd.vht_capa.supp_mcs.rx_mcs_map);
	rxmcs_n &= rxmcs_mask;
	rxmcs_cap = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map);

	txmcs_mask =
		le16_to_cpu(sdata->u.mgd.vht_capa_mask.supp_mcs.tx_mcs_map);
	txmcs_n = le16_to_cpu(sdata->u.mgd.vht_capa.supp_mcs.tx_mcs_map);
	txmcs_n &= txmcs_mask;
	txmcs_cap = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map);
	for (i = 0; i < 8; i++) {
		u8 m, n, c;

		m = (rxmcs_mask >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
		n = (rxmcs_n >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
		c = (rxmcs_cap >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;

		if (m && ((c != IEEE80211_VHT_MCS_NOT_SUPPORTED && n < c) ||
			  n == IEEE80211_VHT_MCS_NOT_SUPPORTED)) {
			rxmcs_cap &= ~(3 << 2*i);
			rxmcs_cap |= (rxmcs_n & (3 << 2*i));
		}

		m = (txmcs_mask >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
		n = (txmcs_n >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
		c = (txmcs_cap >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;

		if (m && ((c != IEEE80211_VHT_MCS_NOT_SUPPORTED && n < c) ||
			  n == IEEE80211_VHT_MCS_NOT_SUPPORTED)) {
			txmcs_cap &= ~(3 << 2*i);
			txmcs_cap |= (txmcs_n & (3 << 2*i));
		}
	}
	vht_cap->vht_mcs.rx_mcs_map = cpu_to_le16(rxmcs_cap);
	vht_cap->vht_mcs.tx_mcs_map = cpu_to_le16(txmcs_cap);
}

void
ieee80211_vht_cap_ie_to_sta_vht_cap(struct ieee80211_sub_if_data *sdata,
				    struct ieee80211_supported_band *sband,
				    const struct ieee80211_vht_cap *vht_cap_ie,
				    struct link_sta_info *link_sta)
{
	struct ieee80211_sta_vht_cap *vht_cap = &link_sta->pub->vht_cap;
	struct ieee80211_sta_vht_cap own_cap;
	u32 cap_info, i;
	bool have_80mhz;

	memset(vht_cap, 0, sizeof(*vht_cap));

	if (!link_sta->pub->ht_cap.ht_supported)
		return;

	if (!vht_cap_ie || !sband->vht_cap.vht_supported)
		return;

	/* Allow VHT if at least one channel on the sband supports 80 MHz */
	have_80mhz = false;
	for (i = 0; i < sband->n_channels; i++) {
		if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
						IEEE80211_CHAN_NO_80MHZ))
			continue;

		have_80mhz = true;
		break;
	}

	if (!have_80mhz)
		return;

	/*
	 * A VHT STA must support 40 MHz, but if we verify that here
	 * then we break a few things - some APs (e.g. Netgear R6300v2
	 * and others based on the BCM4360 chipset) will unset this
	 * capability bit when operating in 20 MHz.
	 */

	vht_cap->vht_supported = true;

	own_cap = sband->vht_cap;
	/*
	 * If user has specified capability overrides, take care
	 * of that if the station we're setting up is the AP that
	 * we advertised a restricted capability set to. Override
	 * our own capabilities and then use those below.
	 */
	if (sdata->vif.type == NL80211_IFTYPE_STATION &&
	    !test_sta_flag(link_sta->sta, WLAN_STA_TDLS_PEER))
		ieee80211_apply_vhtcap_overrides(sdata, &own_cap);

	/* take some capabilities as-is */
	cap_info = le32_to_cpu(vht_cap_ie->vht_cap_info);
	vht_cap->cap = cap_info;
	vht_cap->cap &= IEEE80211_VHT_CAP_RXLDPC |
			IEEE80211_VHT_CAP_VHT_TXOP_PS |
			IEEE80211_VHT_CAP_HTC_VHT |
			IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK |
			IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_UNSOL_MFB |
			IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB |
			IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
			IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN;

	vht_cap->cap |= min_t(u32, cap_info & IEEE80211_VHT_CAP_MAX_MPDU_MASK,
			      own_cap.cap & IEEE80211_VHT_CAP_MAX_MPDU_MASK);

	/* and some based on our own capabilities */
	switch (own_cap.cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) {
	case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ:
		vht_cap->cap |= cap_info &
				IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
		break;
	case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ:
		vht_cap->cap |= cap_info &
				IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
		break;
	default:
		/* nothing */
		break;
	}

	/* symmetric capabilities */
	vht_cap->cap |= cap_info & own_cap.cap &
			(IEEE80211_VHT_CAP_SHORT_GI_80 |
			 IEEE80211_VHT_CAP_SHORT_GI_160);

	/* remaining ones */
	if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)
		vht_cap->cap |= cap_info &
				(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
				 IEEE80211_VHT_CAP_SOUNDING_DIMENSIONS_MASK);

	if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)
		vht_cap->cap |= cap_info &
				(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
				 IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK);

	if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)
		vht_cap->cap |= cap_info &
				IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;

	if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE)
		vht_cap->cap |= cap_info &
				IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE;

	if (own_cap.cap & IEEE80211_VHT_CAP_TXSTBC)
		vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_RXSTBC_MASK;

	if (own_cap.cap & IEEE80211_VHT_CAP_RXSTBC_MASK)
		vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_TXSTBC;

	/* Copy peer MCS info, the driver might need them. */
	memcpy(&vht_cap->vht_mcs, &vht_cap_ie->supp_mcs,
	       sizeof(struct ieee80211_vht_mcs_info));

	/* copy EXT_NSS_BW Support value or remove the capability */
	if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_VHT_EXT_NSS_BW))
		vht_cap->cap |= (cap_info & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK);
	else
		vht_cap->vht_mcs.tx_highest &=
			~cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE);

	/* but also restrict MCSes */
	for (i = 0; i < 8; i++) {
		u16 own_rx, own_tx, peer_rx, peer_tx;

		own_rx = le16_to_cpu(own_cap.vht_mcs.rx_mcs_map);
		own_rx = (own_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;

		own_tx = le16_to_cpu(own_cap.vht_mcs.tx_mcs_map);
		own_tx = (own_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;

		peer_rx = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map);
		peer_rx = (peer_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;

		peer_tx = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map);
		peer_tx = (peer_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;

		if (peer_tx != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
			if (own_rx == IEEE80211_VHT_MCS_NOT_SUPPORTED)
				peer_tx = IEEE80211_VHT_MCS_NOT_SUPPORTED;
			else if (own_rx < peer_tx)
				peer_tx = own_rx;
		}

		if (peer_rx != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
			if (own_tx == IEEE80211_VHT_MCS_NOT_SUPPORTED)
				peer_rx = IEEE80211_VHT_MCS_NOT_SUPPORTED;
			else if (own_tx < peer_rx)
				peer_rx = own_tx;
		}

		vht_cap->vht_mcs.rx_mcs_map &=
			~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2);
		vht_cap->vht_mcs.rx_mcs_map |= cpu_to_le16(peer_rx << i * 2);

		vht_cap->vht_mcs.tx_mcs_map &=
			~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2);
		vht_cap->vht_mcs.tx_mcs_map |= cpu_to_le16(peer_tx << i * 2);
	}

	/*
	 * This is a workaround for VHT-enabled STAs which break the spec
	 * and have the VHT-MCS Rx map filled in with value 3 for all eight
	 * spacial streams, an example is AR9462.
	 *
	 * As per spec, in section 22.1.1 Introduction to the VHT PHY
	 * A VHT STA shall support at least single spactial stream VHT-MCSs
	 * 0 to 7 (transmit and receive) in all supported channel widths.
	 */
	if (vht_cap->vht_mcs.rx_mcs_map == cpu_to_le16(0xFFFF)) {
		vht_cap->vht_supported = false;
		sdata_info(sdata,
			   "Ignoring VHT IE from %pM (link:%pM) due to invalid rx_mcs_map\n",
			   link_sta->sta->addr, link_sta->addr);
		return;
	}

	/* finally set up the bandwidth */
	switch (vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) {
	case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ:
	case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ:
		link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160;
		break;
	default:
		link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80;

		if (!(vht_cap->vht_mcs.tx_highest &
				cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE)))
			break;

		/*
		 * If this is non-zero, then it does support 160 MHz after all,
		 * in one form or the other. We don't distinguish here (or even
		 * above) between 160 and 80+80 yet.
		 */
		if (cap_info & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK)
			link_sta->cur_max_bandwidth =
				IEEE80211_STA_RX_BW_160;
	}

	link_sta->pub->bandwidth = ieee80211_sta_cur_vht_bw(link_sta);

	/*
	 * FIXME - should the amsdu len be per link? store per link
	 * and maintain a minimum?
	 */
	switch (vht_cap->cap & IEEE80211_VHT_CAP_MAX_MPDU_MASK) {
	case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454:
		link_sta->sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_11454;
		break;
	case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991:
		link_sta->sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_7991;
		break;
	case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895:
	default:
		link_sta->sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_3895;
		break;
	}
}

/* FIXME: move this to some better location - parses HE/EHT now */
enum ieee80211_sta_rx_bandwidth
ieee80211_sta_cap_rx_bw(struct link_sta_info *link_sta)
{
	unsigned int link_id = link_sta->link_id;
	struct ieee80211_sub_if_data *sdata = link_sta->sta->sdata;
	struct ieee80211_sta_vht_cap *vht_cap = &link_sta->pub->vht_cap;
	struct ieee80211_sta_he_cap *he_cap = &link_sta->pub->he_cap;
	struct ieee80211_sta_eht_cap *eht_cap = &link_sta->pub->eht_cap;
	u32 cap_width;

	if (he_cap->has_he) {
		struct ieee80211_bss_conf *link_conf;
		enum ieee80211_sta_rx_bandwidth ret;
		u8 info;

		rcu_read_lock();
		link_conf = rcu_dereference(sdata->vif.link_conf[link_id]);

		if (eht_cap->has_eht &&
		    link_conf->chandef.chan->band == NL80211_BAND_6GHZ) {
			info = eht_cap->eht_cap_elem.phy_cap_info[0];

			if (info & IEEE80211_EHT_PHY_CAP0_320MHZ_IN_6GHZ) {
				ret = IEEE80211_STA_RX_BW_320;
				goto out;
			}
		}

		info = he_cap->he_cap_elem.phy_cap_info[0];

		if (link_conf->chandef.chan->band == NL80211_BAND_2GHZ) {
			if (info & IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_40MHZ_IN_2G)
				ret = IEEE80211_STA_RX_BW_40;
			else
				ret = IEEE80211_STA_RX_BW_20;
			goto out;
		}

		if (info & IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G ||
		    info & IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_80PLUS80_MHZ_IN_5G)
			ret = IEEE80211_STA_RX_BW_160;
		else if (info & IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_40MHZ_80MHZ_IN_5G)
			ret = IEEE80211_STA_RX_BW_80;
		else
			ret = IEEE80211_STA_RX_BW_20;
out:
		rcu_read_unlock();

		return ret;
	}

	if (!vht_cap->vht_supported)
		return link_sta->pub->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
				IEEE80211_STA_RX_BW_40 :
				IEEE80211_STA_RX_BW_20;

	cap_width = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;

	if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
	    cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
		return IEEE80211_STA_RX_BW_160;

	/*
	 * If this is non-zero, then it does support 160 MHz after all,
	 * in one form or the other. We don't distinguish here (or even
	 * above) between 160 and 80+80 yet.
	 */
	if (vht_cap->cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK)
		return IEEE80211_STA_RX_BW_160;

	return IEEE80211_STA_RX_BW_80;
}

enum nl80211_chan_width
ieee80211_sta_cap_chan_bw(struct link_sta_info *link_sta)
{
	struct ieee80211_sta_vht_cap *vht_cap = &link_sta->pub->vht_cap;
	u32 cap_width;

	if (!vht_cap->vht_supported) {
		if (!link_sta->pub->ht_cap.ht_supported)
			return NL80211_CHAN_WIDTH_20_NOHT;

		return link_sta->pub->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
				NL80211_CHAN_WIDTH_40 : NL80211_CHAN_WIDTH_20;
	}

	cap_width = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;

	if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ)
		return NL80211_CHAN_WIDTH_160;
	else if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
		return NL80211_CHAN_WIDTH_80P80;

	return NL80211_CHAN_WIDTH_80;
}

enum nl80211_chan_width
ieee80211_sta_rx_bw_to_chan_width(struct link_sta_info *link_sta)
{
	enum ieee80211_sta_rx_bandwidth cur_bw =
		link_sta->pub->bandwidth;
	struct ieee80211_sta_vht_cap *vht_cap =
		&link_sta->pub->vht_cap;
	u32 cap_width;

	switch (cur_bw) {
	case IEEE80211_STA_RX_BW_20:
		if (!link_sta->pub->ht_cap.ht_supported)
			return NL80211_CHAN_WIDTH_20_NOHT;
		else
			return NL80211_CHAN_WIDTH_20;
	case IEEE80211_STA_RX_BW_40:
		return NL80211_CHAN_WIDTH_40;
	case IEEE80211_STA_RX_BW_80:
		return NL80211_CHAN_WIDTH_80;
	case IEEE80211_STA_RX_BW_160:
		cap_width =
			vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;

		if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ)
			return NL80211_CHAN_WIDTH_160;

		return NL80211_CHAN_WIDTH_80P80;
	default:
		return NL80211_CHAN_WIDTH_20;
	}
}

enum ieee80211_sta_rx_bandwidth
ieee80211_chan_width_to_rx_bw(enum nl80211_chan_width width)
{
	switch (width) {
	case NL80211_CHAN_WIDTH_20_NOHT:
	case NL80211_CHAN_WIDTH_20:
		return IEEE80211_STA_RX_BW_20;
	case NL80211_CHAN_WIDTH_40:
		return IEEE80211_STA_RX_BW_40;
	case NL80211_CHAN_WIDTH_80:
		return IEEE80211_STA_RX_BW_80;
	case NL80211_CHAN_WIDTH_160:
	case NL80211_CHAN_WIDTH_80P80:
		return IEEE80211_STA_RX_BW_160;
	case NL80211_CHAN_WIDTH_320:
		return IEEE80211_STA_RX_BW_320;
	default:
		WARN_ON_ONCE(1);
		return IEEE80211_STA_RX_BW_20;
	}
}

/* FIXME: rename/move - this deals with everything not just VHT */
enum ieee80211_sta_rx_bandwidth
ieee80211_sta_cur_vht_bw(struct link_sta_info *link_sta)
{
	struct sta_info *sta = link_sta->sta;
	struct ieee80211_bss_conf *link_conf;
	enum nl80211_chan_width bss_width;
	enum ieee80211_sta_rx_bandwidth bw;

	rcu_read_lock();
	link_conf = rcu_dereference(sta->sdata->vif.link_conf[link_sta->link_id]);
	if (WARN_ON(!link_conf))
		bss_width = NL80211_CHAN_WIDTH_20_NOHT;
	else
		bss_width = link_conf->chandef.width;
	rcu_read_unlock();

	bw = ieee80211_sta_cap_rx_bw(link_sta);
	bw = min(bw, link_sta->cur_max_bandwidth);

	/* Don't consider AP's bandwidth for TDLS peers, section 11.23.1 of
	 * IEEE80211-2016 specification makes higher bandwidth operation
	 * possible on the TDLS link if the peers have wider bandwidth
	 * capability.
	 *
	 * However, in this case, and only if the TDLS peer is authorized,
	 * limit to the tdls_chandef so that the configuration here isn't
	 * wider than what's actually requested on the channel context.
	 */
	if (test_sta_flag(sta, WLAN_STA_TDLS_PEER) &&
	    test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) &&
	    test_sta_flag(sta, WLAN_STA_AUTHORIZED) &&
	    sta->tdls_chandef.chan)
		bw = min(bw, ieee80211_chan_width_to_rx_bw(sta->tdls_chandef.width));
	else
		bw = min(bw, ieee80211_chan_width_to_rx_bw(bss_width));

	return bw;
}

void ieee80211_sta_set_rx_nss(struct link_sta_info *link_sta)
{
	u8 ht_rx_nss = 0, vht_rx_nss = 0, he_rx_nss = 0, eht_rx_nss = 0, rx_nss;
	bool support_160;

	/* if we received a notification already don't overwrite it */
	if (link_sta->pub->rx_nss)
		return;

	if (link_sta->pub->eht_cap.has_eht) {
		int i;
		const u8 *rx_nss_mcs = (void *)&link_sta->pub->eht_cap.eht_mcs_nss_supp;

		/* get the max nss for EHT over all possible bandwidths and mcs */
		for (i = 0; i < sizeof(struct ieee80211_eht_mcs_nss_supp); i++)
			eht_rx_nss = max_t(u8, eht_rx_nss,
					   u8_get_bits(rx_nss_mcs[i],
						       IEEE80211_EHT_MCS_NSS_RX));
	}

	if (link_sta->pub->he_cap.has_he) {
		int i;
		u8 rx_mcs_80 = 0, rx_mcs_160 = 0;
		const struct ieee80211_sta_he_cap *he_cap = &link_sta->pub->he_cap;
		u16 mcs_160_map =
			le16_to_cpu(he_cap->he_mcs_nss_supp.rx_mcs_160);
		u16 mcs_80_map = le16_to_cpu(he_cap->he_mcs_nss_supp.rx_mcs_80);

		for (i = 7; i >= 0; i--) {
			u8 mcs_160 = (mcs_160_map >> (2 * i)) & 3;

			if (mcs_160 != IEEE80211_HE_MCS_NOT_SUPPORTED) {
				rx_mcs_160 = i + 1;
				break;
			}
		}
		for (i = 7; i >= 0; i--) {
			u8 mcs_80 = (mcs_80_map >> (2 * i)) & 3;

			if (mcs_80 != IEEE80211_HE_MCS_NOT_SUPPORTED) {
				rx_mcs_80 = i + 1;
				break;
			}
		}

		support_160 = he_cap->he_cap_elem.phy_cap_info[0] &
			      IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G;

		if (support_160)
			he_rx_nss = min(rx_mcs_80, rx_mcs_160);
		else
			he_rx_nss = rx_mcs_80;
	}

	if (link_sta->pub->ht_cap.ht_supported) {
		if (link_sta->pub->ht_cap.mcs.rx_mask[0])
			ht_rx_nss++;
		if (link_sta->pub->ht_cap.mcs.rx_mask[1])
			ht_rx_nss++;
		if (link_sta->pub->ht_cap.mcs.rx_mask[2])
			ht_rx_nss++;
		if (link_sta->pub->ht_cap.mcs.rx_mask[3])
			ht_rx_nss++;
		/* FIXME: consider rx_highest? */
	}

	if (link_sta->pub->vht_cap.vht_supported) {
		int i;
		u16 rx_mcs_map;

		rx_mcs_map = le16_to_cpu(link_sta->pub->vht_cap.vht_mcs.rx_mcs_map);

		for (i = 7; i >= 0; i--) {
			u8 mcs = (rx_mcs_map >> (2 * i)) & 3;

			if (mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
				vht_rx_nss = i + 1;
				break;
			}
		}
		/* FIXME: consider rx_highest? */
	}

	rx_nss = max(vht_rx_nss, ht_rx_nss);
	rx_nss = max(he_rx_nss, rx_nss);
	rx_nss = max(eht_rx_nss, rx_nss);
	link_sta->pub->rx_nss = max_t(u8, 1, rx_nss);
}

u32 __ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
				  struct link_sta_info *link_sta,
				  u8 opmode, enum nl80211_band band)
{
	enum ieee80211_sta_rx_bandwidth new_bw;
	struct sta_opmode_info sta_opmode = {};
	u32 changed = 0;
	u8 nss;

	/* ignore - no support for BF yet */
	if (opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)
		return 0;

	nss = opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
	nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
	nss += 1;

	if (link_sta->pub->rx_nss != nss) {
		link_sta->pub->rx_nss = nss;
		sta_opmode.rx_nss = nss;
		changed |= IEEE80211_RC_NSS_CHANGED;
		sta_opmode.changed |= STA_OPMODE_N_SS_CHANGED;
	}

	switch (opmode & IEEE80211_OPMODE_NOTIF_CHANWIDTH_MASK) {
	case IEEE80211_OPMODE_NOTIF_CHANWIDTH_20MHZ:
		/* ignore IEEE80211_OPMODE_NOTIF_BW_160_80P80 must not be set */
		link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_20;
		break;
	case IEEE80211_OPMODE_NOTIF_CHANWIDTH_40MHZ:
		/* ignore IEEE80211_OPMODE_NOTIF_BW_160_80P80 must not be set */
		link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_40;
		break;
	case IEEE80211_OPMODE_NOTIF_CHANWIDTH_80MHZ:
		if (opmode & IEEE80211_OPMODE_NOTIF_BW_160_80P80)
			link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160;
		else
			link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80;
		break;
	case IEEE80211_OPMODE_NOTIF_CHANWIDTH_160MHZ:
		/* legacy only, no longer used by newer spec */
		link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160;
		break;
	}

	new_bw = ieee80211_sta_cur_vht_bw(link_sta);
	if (new_bw != link_sta->pub->bandwidth) {
		link_sta->pub->bandwidth = new_bw;
		sta_opmode.bw = ieee80211_sta_rx_bw_to_chan_width(link_sta);
		changed |= IEEE80211_RC_BW_CHANGED;
		sta_opmode.changed |= STA_OPMODE_MAX_BW_CHANGED;
	}

	if (sta_opmode.changed)
		cfg80211_sta_opmode_change_notify(sdata->dev, link_sta->addr,
						  &sta_opmode, GFP_KERNEL);

	return changed;
}

void ieee80211_process_mu_groups(struct ieee80211_sub_if_data *sdata,
				 struct ieee80211_link_data *link,
				 struct ieee80211_mgmt *mgmt)
{
	struct ieee80211_bss_conf *link_conf = link->conf;

	if (!link_conf->mu_mimo_owner)
		return;

	if (!memcmp(mgmt->u.action.u.vht_group_notif.position,
		    link_conf->mu_group.position, WLAN_USER_POSITION_LEN) &&
	    !memcmp(mgmt->u.action.u.vht_group_notif.membership,
		    link_conf->mu_group.membership, WLAN_MEMBERSHIP_LEN))
		return;

	memcpy(link_conf->mu_group.membership,
	       mgmt->u.action.u.vht_group_notif.membership,
	       WLAN_MEMBERSHIP_LEN);
	memcpy(link_conf->mu_group.position,
	       mgmt->u.action.u.vht_group_notif.position,
	       WLAN_USER_POSITION_LEN);

	ieee80211_link_info_change_notify(sdata, link,
					  BSS_CHANGED_MU_GROUPS);
}

void ieee80211_update_mu_groups(struct ieee80211_vif *vif, unsigned int link_id,
				const u8 *membership, const u8 *position)
{
	struct ieee80211_bss_conf *link_conf;

	rcu_read_lock();
	link_conf = rcu_dereference(vif->link_conf[link_id]);

	if (!WARN_ON_ONCE(!link_conf || !link_conf->mu_mimo_owner)) {
		memcpy(link_conf->mu_group.membership, membership,
		       WLAN_MEMBERSHIP_LEN);
		memcpy(link_conf->mu_group.position, position,
		       WLAN_USER_POSITION_LEN);
	}
	rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(ieee80211_update_mu_groups);

void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
				 struct link_sta_info *link_sta,
				 u8 opmode, enum nl80211_band band)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];

	u32 changed = __ieee80211_vht_handle_opmode(sdata, link_sta,
						    opmode, band);

	if (changed > 0) {
		ieee80211_recalc_min_chandef(sdata, link_sta->link_id);
		rate_control_rate_update(local, sband, link_sta->sta,
					 link_sta->link_id, changed);
	}
}

void ieee80211_get_vht_mask_from_cap(__le16 vht_cap,
				     u16 vht_mask[NL80211_VHT_NSS_MAX])
{
	int i;
	u16 mask, cap = le16_to_cpu(vht_cap);

	for (i = 0; i < NL80211_VHT_NSS_MAX; i++) {
		mask = (cap >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
		switch (mask) {
		case IEEE80211_VHT_MCS_SUPPORT_0_7:
			vht_mask[i] = 0x00FF;
			break;
		case IEEE80211_VHT_MCS_SUPPORT_0_8:
			vht_mask[i] = 0x01FF;
			break;
		case IEEE80211_VHT_MCS_SUPPORT_0_9:
			vht_mask[i] = 0x03FF;
			break;
		case IEEE80211_VHT_MCS_NOT_SUPPORTED:
		default:
			vht_mask[i] = 0;
			break;
		}
	}
}